Leading and higher twists in the proton polarized structure function<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mi>p</mml:mi></mml:mrow></mml:msubsup></mml:mrow></mml:math>at large Bjorken<i>x</i>

Simula, Silvano; Osipenko, M.; Ricco, G.; Taiuti, M.

doi:10.1103/physrevd.65.034017

Cited by 58 publications

(79 citation statements)

References 66 publications

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“…It is worthy to note here, that Bloom-Gilman duality for spin-dependent case is strongly violated by the contribution of ∆(1232) resonance [15]. As it was mentioned before, since this resonance does not contribute to the g T structure function [8], it is this function which may be a good candidate to study duality.…”

mentioning

confidence: 72%

QCD radiative and power corrections and generalized Gerasimov-Drell-Hearn sum rules

Soffer

Teryaev²

2004

Phys. Rev. D

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We extend the earlier suggested QCD-motivated model for the Q 2 -dependence of the generalized Gerasimov-Drell-Hearn (GDH) sum rule which assumes the smooth dependence of the structure function g T , while the sharp dependence is due to the g 2 contribution and is described by the elastic part of the BurkhardtCottingham sum rule. The model successfully predicts the low crossing point for the proton GDH integral, but is at variance with the recent very accurate JLAB data. We show that, at this level of accuracy, one should include the previously neglected radiative and power QCD corrections, as boundary values for the model. We stress that the GDH integral, when measured with such a high accuracy achieved by the recent JLAB data, is very sensitive to QCD power corrections. We estimate the value of these power corrections from the JLAB data at Q 2 ∼ 1GeV 2 . The inclusion of all QCD corrections leads to a good description of proton, neutron and deuteron data at all Q 2 .

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mentioning

confidence: 72%

QCD radiative and power corrections and generalized Gerasimov-Drell-Hearn sum rules

Soffer

Teryaev²

2004

Phys. Rev. D

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“…None of the SLAC data had Q 2 below 0.30 GeV 2 ; ∆ 1 and ∆ 2 are sensitive to the behavior of the structure functions at low Q 2 . Also in 2002 there appeared analytic expressions for g 1,2 fit to data by Simula, Osipenko, Ricco, and Taiuti [83], which included JLab as well as SLAC data. Simula et al did not integrate their results to obtain ∆ pol , but had they done so, they would have obtained ∆ pol = (0.4 ± 0.6) ppm [80].…”

Section: Numerics Especially For ∆ Polmentioning

confidence: 99%

Two-Photon Physics in Hadronic Processes

Carlson

Vanderhaeghen

2007

Annu. Rev. Nucl. Part. Sci.

161

173

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Two-photon exchange contributions to elastic electron-scattering are reviewed. The apparent discrepancy in the extraction of elastic nucleon form factors between unpolarized Rosenbluth and polarization transfer experiments is discussed, as well as the understanding of this puzzle in terms of two-photon exchange corrections. Calculations of such corrections both within partonic and hadronic frameworks are reviewed. In view of recent spin-dependent electron scattering data, the relation of the two-photon exchange process to the hyperfine splitting in hydrogen is critically examined. The imaginary part of the two-photon exchange amplitude as can be accessed from the beam normal spin asymmetry in elastic electron-nucleon scattering is reviewed. Further extensions and open issues in this field are outlined.

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“…Also in 2002 there appeared analytic expressions for g 1,2 fit to data by Simula, Osipenko, Ricco, and Taiuti [25], which included JLab as well as SLAC data. They did not at that time integrate their results to obtain ∆ pol .…”

Section: Hyperfine Splitting Calculationsmentioning

confidence: 99%

New evaluation of proton structure corrections to hydrogen hyperfine splitting

Carlson

2007

Can. J. Phys.

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Abstract:We consider the proton structure corrections to hydrogen ground-state hyperfine structure, focusing on a state-of-the-art evaluation of the inelastic nucleon corrections-the polarizability corrections-using analytic fits to the most recent data. We find a value for the fractional correction ∆ pol of 1.3 ± 0.3 ppm. This is 1-2 ppm smaller than the value of ∆ pol one would deduce using hyperfine splitting data and elastic proton structure corrections obtained from modern form factor fits. In addition, we discuss the derivations of the relevant formulas, paying attention to lepton mass effects and to questions surrounding the use of unsubtracted dispersion relations.

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Leading and higher twists in the proton polarized structure functiong1pat large Bjorkenx

Cited by 58 publications

References 66 publications

QCD radiative and power corrections and generalized Gerasimov-Drell-Hearn sum rules

QCD radiative and power corrections and generalized Gerasimov-Drell-Hearn sum rules

Two-Photon Physics in Hadronic Processes

New evaluation of proton structure corrections to hydrogen hyperfine splitting

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